On The Inventory Optimization Of Closed-Loop Supply Chain

Closed-loop supply chain(CLSC) was facilitated to come into being by the circumstance deterioration,law force and benefits driving.While there is only above 10 years for the sprouting and blooming of CLSC theory,the new concept has gained wide attention and warm discussion because of its characteristics of saving resources,befriending circumstance and sustainable development.Targeted at the inventory management of CLSC,this thesis is to do deep research on the concepts, generation,operation model of CLSC and other related issues with the approaches of quantitative and qualitative analysis.Ins the first chapter,we put forward the background and motivation of the thesis,and then a detailed review on the CLSC is given,based on which we summarize the existing problems and point out the possible study fields.In the second chapter,we give a new conception of CLSC,which indicates the characteristics of CLSC is bi-directional,economical and ecological.And then we put forward the four kinds of CLSC operation models founded on recycling,reuse, repair/refurbishing/cannibalization and remanufacturing which make up the traditional categorizing ways by industry.Moreover,it offers brand-new explanation to the generation of CLSC from the economic aspect.Different from the traditional opinions,we take it as granted that the environmental and non- environmental factors create the generation and development of CLSC jointly.In the third chapter,we integrate the five types of reuse and return based inventory management framework given by Fleischmann(2001),and bring forward one inventory framework of CLSC consisted of different reuse modes.Furthermore, we review the models and algorithms of CLSC inventory from the aspects of single echelon and multi-echelon,base stock policy and batch order policy,periodic review and continuous review,and then point out the insufficiency of the existing studies and the future direction.Finally,the position of our study in the inventory framework of CLSC is given. With full consideration of inventory factors,Stackelberg game model is set up upon four kinds of recycling strategies which include manufacturer collection,retailer collection,3^rd Party collection and centralized collection strategies in the fourth chapter.To each kind of strategy,the optimal reaction function and maximal net profit of each actor are analyzed together with the different collection strategy effect and the influence to collection strategy from parameters.In the fifth chapter,We build up z-transformation model of CLSC inventory system and deduce the analytic expression of closed-loop supply chain bullwhip effect upon(R,S) order policy.The impact of remanufacture leadtime(return delay), manufacture leadtime,return rates and forecasting smooth coefficient to bullwhip effect of CLSC is analyzed with the related expression.At the same time,some critical conclusions were derived by analyzing and comparing the bullwhip effect which is corresponded to the five finds of order policy(R,(?)),(R,γO),(R,S),(R,βIP) and(R,γO,βIP).Recoverable mixed-assemble inventory system is one key form of CLSC inventory system with complex structure.Upon the deterministic demand,in the sixth chapter we set up the recoverable mixed-assemble inventory system model respectively under "one order with several repairs" and "one repair with several orders".The methods towards optimal order batch,recovery batch and total inventory cost will be brought out to analyze the impact of recovery rate,demand rate and repairable rate to inventory system.Spare parts inventory management of Shanghai Tobacco(Group) Corporation will be analyzed as real case in the end.Multi-echelon recovery inventory system with batch order is widely used in remanufacturing industries such as auto and electronics.Based on the auto remanufacturing,the two echelon inventory system with batch order and procurement established in the seventh chapter is different from the base stock policy and single echelon inventory system which were worked over before.We build up the model and numerical methods of inventory system,discuss the impact to inventory cost of parameters,analyze the system's optimal disposal strategy,and provide a case study from auto industry.In conclusion,brief discussion about the further working direction will be brought forward.